I enjoyed the article anyway. Thanks for sharing.

Edit: I misread the statement. Thanks for pointing this out to all the repliers! My fault.

The first point of the answer is misleading. Tor is indeed designed with anonymity in mind. The leaks occur in different layers, like the for e.g. chosen BitTorrent client.

https://blog.torproject.org/bittorrent-over-tor-isnt-good-idea/